LJ377MV汽油机曲柄连杆机构设计与有限元分析.pdf

摘要
本文面向工程应用以洛阳北方企业集团公司 LJ750 摩托车产品开发与研
究为背景对汽油机曲柄连杆机构进行了设计和研究简要阐述了曲
柄连杆机构主要部件及发动机平衡轴的设计过程建立了曲柄连杆机构的三维
实体模型并进行了相应的有限元分析和计算
首先在对连杆进行静力学屈曲和模态分析的基础上将弹性接触问题
的有限元法应用于工程实际的连杆接触计算中并与传统的连杆静力学有限元
方法进行了比较表明弹性接触问题的研究方法是曲柄连杆机构研究中比传统
静力学方法更为有效的研究方法其次利用相似机型得到的活塞热边界条件
完成了活塞的有限元计算与分析获得了活塞的温度及其应力分布特性并应
用活塞环三维流动动压润滑分析模型研究了活塞环几何结构设计参数等对活塞
润滑性能的影响再次对发动机曲轴和平衡轴进行了设计和分析应用有限
元法对曲轴及平衡轴进行了静力学和模态计算与分析结果表明所设计的曲轴
及平衡轴满足设计要求最后在上述基础上对曲柄连杆机构进行了动力学
研究并以连杆为例对其动力学和静力学计算结果进行了对比分析结果表明
动力学计算与静力学相比更为优越

关键词发动机曲柄连杆机构有限元动力学分析














II
Abstract
In this paper, a crankshaft-connecting rod mechanism in
studied and designed, built in 3-D mode, and optimized
through finite element analysis of pose including piston, connecting rod and crankshaft.
First, on base of the static calculation, and inflection and modal analysis of the
crankshaft-connecting rod mechanism, the author applies finite element analysis method to
the elastic contact between the connecting rod and the piston pin and the sliding bear bush and
conventional static calculation of pose in the above virtual engineering question.
Comparison between elastic contact result and static result shows the elastic contact method is
more effective in the study of crankshaft-connecting rod mechanism. By analyzing and
acquiring the piston’s heat boundary condition in a similar mode, the author presents the
temperature and stress field display characteristic of the piston using finite element calculation
software. Through the analysis of the piston ring’s 3-D fluid dynamic stress lubrication mode, its
geometric design parameter’s impact on piston design lubrication performance is investigated.
Second, the design, and static and modal analysis of the crankshaft and counterbalance shaft are
presented. The result shows the designed crankshaft and counterbalance shaft meet the
requirements. Last, the paper also involves the dynamic analysis of the mechanism. And as an
examp